Process of coating manufactured products



Patented Mar. 27, 1928.

warren STATES 1,664,034 PATENT; OFFICE.

ARTHUR W. HUSEMAN AND THOMAS A. LEONARDQOF CHICAGO, ILLINOIS.

PROCESS OF COATING MANUFACTURED PRODUCTS.

No Drawing. Application filed June 19,

This invention relates to a new and ime proved process of coating manufactured products and has for its object to provide a new and improved process ofthis description. It often happens in practicethat pieces of material, such for example as metal, must be covered with some suitable coating, and yet there are parts of the surface or surfaces upon which it is not desired to have this coating. One instance for example where such conditions prevail is where metal pieces are to be japanned or enameled and portions of such pieces are required to have, no japan or, enamel upon F them, and in some instances these uncovered portions must be finished by a tool. It is the present practice to entirely cover the pieces of material with japan or enamel which is baked on it, and then put the pieces in the machine and finish these surfaces from which the coating has been removed. Thisprocessis expensive and requires the piece of material afterbeing japanned or enameled to be put in the machine and handled, thus endangering the coating upon it. Again these pieces of material when going through the machining process, are handled a number of times and hauled around on trucks and are being put in and taken out of various machines and thrown on benches, all of which endangers the coating and makes it often necessary to recoat them.

One of the objects of the present invention is to provide a process by means of which the piece of material may be finished and have all the machine work done upon it before'it is coated, and then coat it in such a manner that the portion of the coating on the parts which are to be free from the coating, can be easily and quickly removed.

The invention has other objects which are more particularly pointed out in the accompanying description and may be applied to any suitable material.

For purposes of illustration we will describe our invention in connection with japanning o-r enameling pieces of metal. When our invention is used these pieces of metal can first be completely finished. All the tool work required may be done upon it, and all plating of the parts may be done. When the piece of material is finished, the portion or portions thereof which are to be free from the coatingxwhen finished are covered with a gelatinous proteic substance, such for example as fish glue or the albu- 1922. Serial no. 569,429.

minoidal glue made from the hoofs, horns,

feathers and hair of birds, or. that made stance which quickly evaporates.v The sur faces which it is desired to have free ofthe permanent coating are covered with this gelatinous proteic substance. It is permitted to dry and then it is coated with shellac, enamel or other. permanent coating desired. It is then baked, andthe gelatinous substance forms a comparatively thick white bubbly mass which adheres to the surface ofthe piece of material, but which prevents the permanent coatingfrom adhering thereto, and so acts upon theipermanent coating as to make it easily removable by simply brushing with a brush or with the hand or with any suitable removing device After the baking the permanent coating at the point or points where the temporary coating is applied, is removed, as well as thetemporary coating, leaving the material with a finished surface or surfaces at this point or these points. The removal of the coatings may be accomplished in any desired manner, as by a brush, rag or the like, or even by the hand, as they are in such condition that they can be easily rubbed off. If for example the piece of material has a hole with screw threads, this temporary coating will be applied to these screw threads, and then the entire piece may be dipped in or otherwisecoated with the permanent coating material and then baked,.

and then the brush run through the hole, and this will quickly and easily remove both the permanent coating material and the temporary coating material, leaving the threads free and clean.

It will thus be seen that by means of this invention all handling of the material after the permanent coating is placed thereon is avoided and allthe expense and danger to the injury thereof thus avoided. The

' about the surface.

' silver or the like, as this plating may behandlingand finishing mayall be completed, the final act being to put on the permanent coating.

It will further be noted that the area of surface tobe left free of the permanent coating may be accurately determined, because this surface Will depend upon the amount of the surface covered by the temporary coating, and When. this portion of-the surface is rubbed after baking, both coatings will quickly and easily come off, leaving aipr'operly defined unbroken borderline In other Words the amount of coating to be rubbed off is predetermined by the area covered by' the temporary coating and the additional border line of the permanent coating around this surface is also predetermined and may be madeany shape desired and the party rubbing ofl thecoatings need not be concerned as to the surface to be free, because such surface is determined entirely'by the temporary coating and by the person who applies this temporary coating.

The invention is of great importance also in cases" Where portions of the surface must beplated with somematerial, such as nickel,

accomplished before the permanentcoating herein referred to is applied, the plated surfacev being covered With the temporary coating before the perinaent' coating is applied to the pieceofmateriali- It 'Will thus be seen" that this invention may be applied to any suitable material Where such material requires only partial coating whether due to the fact that ithas some plated surfaceor' surfaces, or some surface or surfaces which must be machined, or some surface or surfaces which for any other reason must be free of the permanent coating herein referredto, and we'ha've used the term partial coating as applying not to any plating or the like, but to the final permanent coating put on over the entire surface, including" that to Which the tem porary coating is applied, but which When the product" is finished covers" only a part of the device due to the factthat the" portion thereof over the teniporary coating has been removed. Te claim:

The process of coating metal, parts of Which must 'be' machined, so" that} the portion of the coating from the machined parts may be easily removed, which consists in first machining the parts tobe machined and then applying a coating of gelatinous, prot'e'ic substance in'a liquid form to the portions of the surface of the metal that have been machined from which the permanent coating is toberemoved, their coating with the permanent enamel in a liquid form the entire surface tobecoated,-incli1'd' ing the machined surface on which the gelatinous,proteicsubstance is placed, thenh'eati.ng'-the metal and coating; until the gelatinous, proteic substance forms a White,-b ubbly mass thicker than the enamel coating at the points'freefr'o'mth'e gelatinous, proteic substance, and tlien bri'ishing the bubbly mass from the surface ofthe' metal? so' as to leave it exposed.

ARTHUR THOMAS LEONARD: 

